Harry Potter: Troll

The giant Troll stomps heavily to his feet. He's swinging a thick club above his small head. What's got him so angry? There's not much time to think about it, though. Better get out of here! Afterall, this giant is really strong and almost impossible to defeat. Luckily he only has a small brain so you can probably trick him and lure him into a trap.

It's pretty clear from the start that the Troll doesn't have too much between his ears, judging by the size of his head. But that's no reason to be complacent. Because he is quick to anger. And then the giant swings his mighty club and comes after his opponent without thinking twice.